Self assembly of elements for displays

ABSTRACT

Various embodiments of methods and systems for designing and constructing displays from multiple light emitting elements are disclosed. Display elements having different light emitting and self-organizing characteristics may be used during display assembly.

CROSS-REFERENCE TO RELATED APPLICATIONS

“The present application is related to and claims the benefit of theearliest available effective filing date(s) from the following listedapplication(s) (the “Related Applications”) (e.g., claims earliestavailable priority dates for other than provisional patent applicationsor claims benefits under 35 USC § 119(e) for provisional patentapplications, for any and all parent, grandparent, great-grandparent,etc. applications of the Related Application(s)).

RELATED APPLICATIONS

-   -   For purposes of the USPTO extra-statutory requirements, the        present application constitutes a continuation-in-part of U.S.        patent application Ser. No. 11/078,206, entitled SELF ASSEMBLY        OF ELEMENTS FOR DISPLAYS, naming W. Daniel Hillis, Nathan P.        Myhrvold, Clarence T. Tegreene, Lowell L. Wood, Jr., and        Victoria Y. H. Wood as inventors, filed 11 Mar. 2005, which is        currently co-pending, or is an application of which a currently        co-pending application is entitled to the benefit of the filing        date.    -   For purposes of the USPTO extra-statutory requirements, the        present application constitutes a continuation-in-part of U.S.        patent application Ser. No. ______, entitled SELF ASSEMBLY OF        ELEMENTS FOR DISPLAYS, naming W. Daniel Hillis, Nathan P.        Myhrvold, Clarence T. Tegreene, Lowell L. Wood, Jr., and        Victoria Y. H. Wood as inventors, filed substantially        contemporaneously herewith, which is currently co-pending, or is        an application of which a currently co-pending application is        entitled to the benefit of the filing date.    -   For purposes of the USPTO extra-statutory requirements, the        present application constitutes a continuation-in-part of U.S.        patent application Ser. No. 11/078,207, entitled ELEMENTS FOR        SELF-ASSEMBLING DISPLAYS, naming W. Daniel Hillis, Nathan P.        Myhrvold, Clarence T. Tegreene, Lowell L. Wood, Jr., and        Victoria Y. H. Wood as inventors, filed 11 Mar. 2005, which is        currently co-pending, or is an application of which a currently        co-pending application is entitled to the benefit of the filing        date.        The United States Patent Office (USPTO) has published a notice        to the effect that the USPTO's computer programs require that        patent applicants reference both a serial number and indicate        whether an application is a continuation or        continuation-in-part. Stephen G. Kunin, Benefit of Prior-Filed        Application, USPTO Official Gazette Mar. 18, 2003, available at        http://www.uspto.gov/web/offices/com/sol/og/2003/week11/patbene.htm.        The present applicant entity has provided above a specific        reference to the application(s) from which priority is being        claimed as recited by statute. Applicant entity understands that        the statute is unambiguous in its specific reference language        and does not require either a serial number or any        characterization, such as “continuation” or        “continuation-in-part,” for claiming priority to U.S. patent        applications. Notwithstanding the foregoing, applicant entity        understands that the USPTO's computer programs have certain data        entry requirements, and hence applicant entity is designating        the present application as a continuation-in-part of its parent        applications as set forth above, but expressly points out that        such designations are not to be construed in any way as any type        of commentary and/or admission as to whether or not the present        application contains any new matter in addition to the matter of        its parent application(s). All subject matter of the Related        Applications and of any and all parent, grandparent,        great-grandparent, etc. applications of the Related Applications        is incorporated herein by reference to the extent such subject        matter is not inconsistent herewith.”

TECHNICAL FIELD

The present application relates, in general, to the field of displays,and particularly to methods of manufacture thereof.

BACKGROUND

Displays used in television screens, computer monitors, electronic signsor displays, and the like may be formed from arrays of large numbers oflight emitting elements that may be controlled to display time-varyingpatterns of light. Color displays typically include light emittingelements that emit light of several colors. Displays commonly includeelements capable of emitting red, green, or blue wavelengths(corresponding to the color sensitivities of the photoreceptors in thehuman eye), since by adjusting the intensity of the three colorsappropriately, any color in the visible spectrum can be represented tothe human eye.

SUMMARY

Embodiments of methods and systems for self-organization and assembly ofdisplay elements to form displays are disclosed herein. Features ofvarious embodiments will be apparent from the following detaileddescription and associated drawings.

BRIEF DESCRIPTION OF THE FIGURES

Features of the invention are set forth in the appended claims. Theexemplary embodiments may best be understood by making reference to thefollowing description taken in conjunction with the accompanyingdrawings. In the figures, like referenced numerals identify likeelements.

FIG. 1A illustrates a plurality of a display elements disposed on asubstrate;

FIG. 1B illustrates display elements in a self-organized array on asubstrate;

FIG. 2 illustrates display elements having complementary surfacecharacteristics;

FIG. 3 illustrates a triad formed from the display elements of FIG. 2;

FIG. 4 is a flow diagram of a method of manufacturing a display;

FIG. 5 depicts display elements having different shape characteristics;

FIG. 6 illustrates a self-organized array of the display elements ofFIG. 4.

FIG. 7 shows distribution of display elements onto a substrate;

FIG. 8 shows an alternative method of distribution of display elementsonto a substrate;

FIGS. 9A-9C depict self-organization of a display element array;

FIGS. 10A-10C illustrate the manufacture of an embodiment of a display;

FIG. 11 illustrates connection of display elements to a substrate;

FIG. 11 illustrates connection of display elements to other displayelements and to a substrate;

FIGS. 13A-13 c illustrate transfer of connected display elements fromone substrate to another;

FIGS. 14A-14D illustrate assembly of display elements on a liquidsubstrate;

FIG. 15 shows an alternative embodiment of display elements on asubstrate;

FIG. 16 depicts a further embodiment of assembled display elements;

FIG. 17 depicts display elements on a non-planar substrate;

FIG. 18 depicts a display assembly process;

FIG. 19 depicts a display element design process;

FIG. 20 shows an embodiment of a display element array;

FIG. 21 shows another embodiment of a display element array;

FIG. 22 shows another display element array;

FIG. 23 depicts an embodiment used in a computer monitor;

FIG. 24 depicts an embodiment used in a television screen;

FIG. 25 depicts an embodiment used in an electronic sign;

FIG. 26 depicts an embodiment used in an item of apparel;

FIG. 27 depicts an embodiment used in a decorative object;

FIGS. 28A-28D illustrate the manufacture of a display having severalregions;

FIG. 29 illustrates sequential distribution of display elements on asubstrate;

FIG. 30 illustrates distribution of display elements on several regionsof a substrate;

FIG. 31 illustrates an alternative embodiment of a display elementarray;

FIG. 32 illustrates a method of replacing display elements;

FIG. 33 is a flow diagram of the method of claim 32; and

FIG. 34 is a flow diagram of a further method of replacing displayelements.

DETAILED DESCRIPTION

In the following detailed description, reference is made to theaccompanying drawings, which form a part hereof. The detaileddescription and the drawings illustrate specific exemplary embodimentsby which the invention may be practiced. These embodiments are describedin sufficient detail to enable those skilled in the art to practice theinvention. It is understood that other embodiments may be utilized, andother changes may be made, without departing from the spirit or scope ofthe present invention. The following detailed description is thereforenot to be taken in a limiting sense, and the scope of the presentinvention is defined by the appended claims.

Throughout the specification and claims, the following terms take themeanings explicitly associated herein unless the context dictatesotherwise. The meaning of “a”, “an”, and “the” include pluralreferences. The meaning of “in” includes “in” and “on.” A reference tothe singular includes a reference to the plural unless otherwise statedor inconsistent with the disclosure herein.

FIGS. 1-3 illustrate the manufacture of a three-color display accordingto one exemplary embodiment. According to this embodiment, threedifferent types of display elements, each type capable of emitting lightof a respective one of three colors, self-organize to form an array ofdisplay elements. Self-organized display elements are assembled to forma display made up of display elements that may be individuallycontrolled by suitable control signals to generate desired patterns oflight. FIG. 1A illustrates multiple display elements of three differenttypes 20, 30, and 40, disposed on substrate 10. In this exemplaryembodiment, first display element type 20 emits light in a redwavelength band, second display element type 30 emits light in a greenwavelength band, and third display element type 40 emits light in a bluewavelength band.

While red, green, and blue light emitting elements assembled as a triadare presented in this exemplary embodiment, other combinations ofcolors, other numbers of elements, and other light controlling types ofelements, such as light absorbing, reflecting, or filtering structures(e.g., LCD elements), may be appropriate in some configurations.Moreover, as described below, such assemblies are not limited to singleelements of each type or one-to-one correspondence of elements of eachtype.

FIG. 1B depicts a self-organized array 50 of display elements 20, 30,and 40, formed on substrate 10. Self-organized array 50 is formed byvirtue of display elements 20, 30 and 40 having surface, shape, or othercharacteristics that predispose the display elements to self-organizeinto preferred arrangements with respect to other display elements.Self-organized array 50 includes multiple triads 60 (one of which isindicated by the shaded display elements in FIG. 1B). Each triad 60includes a single display element of first display element type 20, asingle display element of second display element type 30, and a singledisplay element of third display element type 40. Thus, each triad 60includes one display element capable of emitting light in a redwavelength band, one display element capable of emitting light in agreen wavelength band, and one display element capable of emitting lightin a blue wavelength band. Self-organized array 50 may be made up ofmultiple complete triads 60 as well as individual display elements 20,30 and 40 that are not members of complete triads. In this example,self-organized array 50 is characterized by a repeating pattern that hasboth short and long range order. A relatively small self-organized array50 is depicted for purposes of illustration, but in many applications,larger arrays in which the triad pattern is repeated a large number oftimes may be used. For example, displays for use as computer ortelevision screens may include arrays of display elements made up ofthousands or millions of display elements. Each of display element types20, 30, and 40 is configured to form preferred associations with theother display element types, such that the display elementsself-organize into a pattern that may have both short or long-rangeorder.

FIG. 2 illustrates, in simplified form, how display element types 20,30, and 40 are configured to promote the formation of preferredassociations between different display element types. In this example,each display element includes surface regions having characteristics orproperties that cause it to associate preferentially with the other twotypes of display elements in a well-defined manner. First surfaceproperty 22 on first display element type 20 interacts with firstcomplementary surface property 34 on second display element type 30,second surface property 32 on second display element type 30 interactswith second complementary surface property 44 on third display elementtype 40, and third surface property 42 on third display element type 40interacts with third complementary surface property 24 on first displayelement type 20. First surface property 22, second surface property 32,and third surface property 42 are depicted as triangles, circles, andrectangles, while first complementary surface property 34, secondcomplementary surface property 44, and third complementary surfaceproperty 24 are depicted as open structures capable of fitting about atriangle, a circle, and a rectangle, respectively. These shapesgenerically represent how different display element surface regions mayhave different characteristics to promote self-organization of displayelements into preferred arrangements, and are not intended to belimiting with respect to specific types of surface properties.

Properties or characteristics that may promote selective association orinteraction of surface regions may include macro and microscale shapeand surface properties. Shape characteristics such as concavities,convexities, or various combinations thereof may be used to promote selfassembly, as described in U.S. Pat. No. 6,507,989; Srinivasan et al., J.Microelectromechanical Systems, Vol. 10, No. 1, pp. 17-24, March 2001;Zheng et al.; Proc. Natl. Acad. Sci., Vol 101, No. 35, pp. 12814-12817,Aug. 31, 2004; and Whitesides and Grzybowski, Science Vol. 295, pp.2418-2421, Mar. 29, 2002; all of which are incorporated herein byreference. Surface characteristics that promote self assembly includebut are not limited to charge or surface energy properties, magneticproperties, or binding affinities, as discussed in Bowden et al., J. Am.Chem. Soc., Vol. 121, pp. 5373-5391, 1999 and Srinivasan et al., J.Microelectromechanical Systems, Vol. 10, No. 1, pp. 17-24, March 2001;both of which are incorporated herein by reference. Such properties maybe conferred on a surface by molecules bound or otherwise adhered orapplied to the surface. Properties that have an effect at the surfacemay also be internal properties of a display element; e.g., a surfacemagnetic field may be produced by magnetized structures within a displayelement. Molecular structures may promote association or interactionsincluding charge interactions, hydrogen bonding, molecular bonding, orother molecular interactions. The surface may, for example, be coatedwith biomolecules having specific binding affinities. Selectiveinteractions of biomolecules to other biomolecules or to non-biologicalmolecules including, but not limited to, base pairing of complementarynucleic acid sequences, amino acid and/or protein-protein interactions,or antibody-antigen interactions, may be employed in some embodiments,as described in Montemagno and Bachard; Nanotechnology, Vol. 10, pp.225-231, 1999; Chung et al., Small, Vol. 1, pp. 1-5, 2005; and Jakab etal., Proc. Natl. Acad. Sci. Vol 101, No. 9, pp. 2865-2869, Mar. 2, 2004,all of which are incorporated herein by reference. For the purpose ofpromoting self-organization, interactions or associations betweendisplay elements may range from relatively weak to relatively stronginteractions or associations. Individual display elements may have bothdistinctive shape and surface properties selected to promote theformation of preferred associations with one or more other types ofdisplay elements with a degree of preference that depends upon the typeof display element.

According to one preferred embodiment, display elements may have acharacteristic shape or surface property and include a light emittingelement capable of emitting light of a characteristic wavelength band.The characteristic shape or surface property is adapted to cause eachdisplay element to form preferred associations with one or more othertypes of display elements with a degree of preference that depends uponthe type of display element. In certain embodiments, display elementshave one or more characteristic shape or surface properties that areselected to provide a relatively lower preference for formingassociations with other display elements of the same type than forforming associations with other display elements of different types.

FIG. 3 depicts display elements of types 20, 30, and 40 that haveinteracted to form a triad 60. In this example, each of the threedisplay element types interacts preferentially with the two otherdisplay element types. For each display element within triad 60, surfaceregions having a particular surface property have interacted withsurface regions having complementary surface properties on other displayelements, causing the display elements to form specific associationswith display elements of the other two types. This is represented, forexample, by the pairing of circles symbolizing second surface property32 with open circles symbolizing second complementary surface property44. Individual triads or repeating patterns made up of complete orpartial triads represent preferred arrangements or patterns of displayelements types 20, 30, and 40. As depicted in FIG. 1A, display elementsmay be disposed on a substrate, following which they self-organize orself assemble into a preferred arrangement, as determined by theirrespective surface or shape characteristics. In some embodiments,movement of display elements into preferred arrangements isenergetically favored. In some cases, surface or shape characteristicsmay produce sufficiently strong attractions between display elementsthat they self-assemble into a preferred arrangement on the substratewithout further input of energy. In many cases, however, input of energy(e.g., an activation energy) may be required to cause display elementsto move into their preferred arrangement. Energy may be input to thedisplay elements by imparting relative motion between display elementsand substrate, e.g. by shaking or vibrating the substrate. Displayelements may then move with respect to each other until they eventuallyform preferred associations within the group of display elementsdisposed on the substrate. Other forms of activation energy (e.g.,light, heat, chemical energy) may also be used to promote formation ofpreferred associations. One or more activation energies may be appliedindependently or a plurality of forms of activation energies may beapplied in combination.

As depicted in FIG. 4, an exemplary method of forming a displayaccording to certain embodiments includes disposing a plurality ofdisplay elements of a plurality of types onto a substrate at step 82,inducing relative movement of the display elements and the surfacesufficient to produce association of at least a portion of the displayelements with other display elements to form a group of associateddisplay elements at step 84, and connecting the group of associateddisplay elements in fixed relationship to each other at step 86. Each ofthe plurality of types of display elements may be configured to formpreferred associations with one or more other types of display elements,with the degree of preference dependent on the type of the displayelement. The relative movement induced between the display elements andthe surface may be sufficient to permit the display elements toself-organize to form preferred associations within the group ofassociated display elements.

FIGS. 5 and 6 illustrate how display elements having different shapecharacteristics may be used in the construction of self-organizingarrays. Two display element types 100 and 102 are depicted in FIG. 5.Convex display element 100 has a flattened cylindrical shape with tworound, parallel, opposing faces 104 and 106 and generally convex sides108. Convex display element 100 emits light having wavelength band λ₁₀₀.Concave display element 102 is a generally flattened shape having twoparallel opposing faces 110 and 112. Concave display element 102 may beof substantially the same thickness as convex display element 100.Opposing faces 110 and 112 are roughly triangular in shape. Concavedisplay element 102 has three generally concave sides 114 havingcurvatures adapted to fit against convex side 108 of display elementtype 100. Concave display element 102 emits light having wavelength bandλ₁₀₂.

FIG. 6 illustrates an array 120 formed by multiple display elements 100and 102. It can be seen that each convex display element 100 has sixneighboring concave display elements 102, while each concave displayelement 102 has three neighboring convex display elements 100. If thearray pattern is extended, the overall ratio of display elements of type102 to display elements of type 100 in the array pattern is 2:1.

FIG. 7 illustrates a method of disposing display elements 150 onto asubstrate 10. In the embodiment of FIG. 6, display elements 150 arepoured onto substrate 10 from dispenser 160. Note that in the varioussubsequently described embodiments, reference number 150 applies todisplay elements in general, which may be of two, three, or moredifferent types. As used herein, ‘pouring’ refers to a process by whichmultiple display elements are moved onto substrate 10 from a containeror dispenser by means of gravity. Display elements poured onto substrate10 may spread out into a single layer on substrate 10. Spreading ofdisplay elements onto substrate 10 may be facilitated, for example, byshaking or vibration of substrate 10. If display elements 150 are smallenough and have suitable shape and surface characteristics, theirbehavior may be powder- or fluid-like. In order to facilitate thedistribution of display elements onto substrate 10, display elements maybe mixed into a liquid and applied to substrate 10 as a slurry,emulsion, suspension, colloid, or gel. Movement of display elements 150on substrate 10 may also be facilitated by various mechanical spreaders,stirrers, etc., instead of or in addition to shaking, vibration, orother methods of imparting energy to the display elements and/orsubstrate.

FIG. 8 illustrates another method of disposing display elements 150 ontosubstrate 10 by spraying. Display elements are ejected from a spraynozzle 170 under pressure. Spray nozzle 170 may be configured todisperse display elements 150 over substrate 10. As described inconnection with the embodiment of FIG. 7, display elements may be mixedinto a liquid, fluidized by the addition of a gas, or may be depositedwithout such mixing, for example, in a manner analogous to an hourglass.

In order to promote self-organization of display elements, relativemovement of the multiple display elements and the substrate is induced.Such movement may be imparted, for example, by shaking or vibration ofthe substrate. Inducing relative movement of the display elements andsurface may be sufficient to produce association of at least a portionof the display elements with other display elements to form a group ofassociated display elements. The induced movement may be sufficient topermit the display elements to self-organize to form preferredassociations within the group of associated display elements. Themovement may cause the display elements to distribute into a singlelayer on the substrate. In some embodiments, the induced movement ispreferably sufficient to permit display elements to self-organize intopreferred associations.

Relative movement of the display elements and the surface may be inducedby shaking or vibrating the surface, or by otherwise moving the surface.The induced movement may be random or substantially random. The movementmust be sufficient to move display elements relative to other displayelements in order to cause display elements to come into proximity andhave opportunity for interaction and/or association with displayelements of various types. The pattern of shaking or vibration may bemodified over time; e.g., more vigorous movement may be used to causedisplay elements to form a single layer, while movement that is gentler(or of a different frequency, direction, etc.) may be more effective forpromoting associations of display elements within a single layer.Depending on the size and type of display elements and substrate,various methods of imparting motion and/or interaction between displayelements and substrate may be used, and the embodiments depicted hereinare only examples.

As shown in FIG. 9A, display elements 150 disposed on substrate 10 bypouring or spraying, (as described in connection with FIGS. 7 and 8, orby other methods), may not be distributed over substrate 10 in a singlelayer; in some regions (e.g., region 180 in FIG. 9A) display elementsmay be piled on other display elements in two or more layers. In manycases it is preferred that display elements distribute into a singlelayer on substrate 10. Distribution of display elements into a singlelayer may be aided by gravity as well as by induced movement betweendisplay elements and surface. In certain embodiments, distribution ofdisplay elements into a single layer may be aided by repulsion of one ormore surfaces of the display element from the substrate surface. Suchrepulsion may take place, for example, because of surface energyeffects, surface magnetic properties and the like due to suitabletreatment of display elements and substrate surfaces. At the stepdepicted in FIG. 9B, shaking or vibrating substrate 10 may cause displayelements to disperse further to form a single layer of display elementson substrate 10. Further shaking or vibration may be applied to causedisplay elements 150, now distributed in a single layer on substrate 10,to move into preferred associations or groupings to form aself-organized display element array 190 as shown in FIG. 9C. Selforganized display element array 190 may have an irregular shape; inorder to form a display having a desired shape and size, display elementarray 190 may be cut or otherwise subdivided, e.g., along lines 201,202, 203 and 204, to obtain a finished display element array of thedesired configuration.

FIGS. 10A through 10C illustrate, in cross-sectional view, a process forconstructing an embodiment of a self-organized display element array.Although three types of display elements (indicated by reference numbers20, 30, and 40, discussed previously in connection with FIGS. 1-3) aredepicted in FIGS. 10A-10C, the illustrated process is suitable forconstructing self-assembling arrays made up of larger or smaller numbersof types of display elements, and is not limited to any particular typeor number of display elements. In FIG. 10A, a plurality of displayelements 20, 30, and 40 are disposed on a first substrate 10. Asdescribed previously, motion is induced in display elements 20, 30 and40 relative to first substrate 10, causing the display elements 10, 30,and 40 to move into a self-organized display element array 50, as shownin FIG. 10B. In FIG. 10C, display elements 20, 30 and 40 are connectedtogether to form connected display element array 220. Connections 222between display elements may provide mechanical connections betweendisplay elements.

Display elements may be held in fixed relationship to each other inorder to maintain a desired spacing between light emitting elements. Insome cases, the interaction between display elements that is used toproduce self-organization of display elements may be sufficiently strongthat display elements will be joined securely without any furtherconnection being provided between the display elements. In many cases,however, the association of display elements may not providesufficiently secure connection of the display elements for the intendedapplication. In such cases, associated display elements may be connectedtogether by various methods. Display elements may be held in fixedspatial relationship with respect to other display elements by directconnections between adjacent display elements, or by connection ofdisplay elements to a substrate. Connections between display elementsmay provide structural or mechanical stability or rigidity. They mayalso provide electrical, optical, or other connections that provide forthe transfer of data, power, or control signals between display elementsand other display elements and/or a substrate. Connections betweendisplay elements may conduct thermal energy, thus providing a desiredthermal environment, e.g. through providing a heat sink, cooling, orheating. Control and power signals may be transmitted to displayelements by various means, including wireless transmissions, andassembly of display elements into arrays may be a separate process fromthe formation of control links to display elements.

Connections between display elements may be rigid or flexible. In someembodiments, a display element array formed of assembled and connecteddisplay elements may have sufficient structural integrity to be usedwithout a supporting substrate. Display element arrays for use intelevision screens or computer monitors may be formed on rigid andsubstantially planar substrates, or be sufficiently rigid to beself-supporting. However, in some applications of display elementarrays, it may be desirable for display element arrays to be formed onflexible substrates, or be self-supporting and flexible. Display elementarrays formed on non-planar rigid or semi-rigid substrates may be usedin other embodiments.

In some embodiments mechanical connections between display elements mayserve only or primarily to maintain display elements in appropriatespatial relationship to other display elements, and may not lendsignificant strength to the display element array as a whole. In someembodiments mechanical connections may provide strength and structuralintegrity to the assembled array as a whole. Mechanical connections maybe formed through the use of various adhesives, including self-fusingadhesives, similar to or including self-fusing silicone adhesives, anexample of which is found in 3M® Scotch™ Self-Fusing Silicone RubberElectrical Tape. They may also be formed by causing the material of thedisplay elements themselves to fuse or adhere together. Such fusing oradhesion could be produced by applying heat, chemical treatment,pressure (for example, either steady or intermittent pressure, orultrasonic pulses) to form connections between display elements. Suchconnections may be based on melting or sintering of display elementmaterials, chemical bonding, cross linking, and various other processes,as known to those of skill in the relevant arts, exemplified by Graciuset al., Science, Vo. 280, pp. 1170-1172, Aug. 18, 2000 and Zheng et al.;Proc. Natl. Acad. Sci., Vol 101, No. 35, pp. 12814-12817, Aug. 31, 2004,both of which are incorporated herein by reference.

In some embodiments, connections between display elements may includeone or more electrical connections between display elements. Electricalconnections may permit the transmittal of control, data, and/or powersignals. In some embodiments, connections between display elements mayinclude one or more optical connections between display elements for thetransmittal of control or data signals. Mechanical connections betweendisplay elements may be formed by adhesives of various types, dependingon the material(s) used in the display elements. Electrical or opticalconnections may require the alignment of contact regions (which mayoccur simultaneously with self-organization of display elements) andformation of an electrical or optical connection, by suitable processesas listed above or other processes as will be known to those of skill inthe relevant arts, such as conductive epoxies, mating metal surfaces orsolder reflow.

FIGS. 11 and 12 illustrate several alternative methods for maintainingdisplay elements in appropriate relationship to each other. In theembodiment shown in FIG. 11, display elements 150 may be connected tosubstrate 10 by connection 230, but not connected to other displayelements 150. In another exemplary embodiment, as shown in FIG. 12,display elements may be connected to adjacent display elements 150 byconnections 222 as well as to substrate 10 by connection 230.Connections 222 between display elements 150, and connection 230 betweendisplay elements 150 and substrate 10 may provide only a mechanicalconnection between elements. In some embodiments the mechanicalconnection may serve only or primarily to maintain display elements inappropriate spatial relationship to other display elements, but not lendsignificant strength to the display element array as a whole. In someembodiments, substrate 10 may provide strength and structural integrityto the assembled array. In some embodiments, connection 230 may includeone or more electrical connections between display elements 150 andsubstrate 10. Electrical connections may permit the transmittal ofcontrol, data, and/or power signals. In some embodiments, connection 230may include one or more optical connections between display elements 150and substrate 10, for the transmittal of control or data signals.Connection 230 may provide for the transfer of thermal energy betweendisplay elements 150 and substrate 10, which may provide a desiredthermal environment, e.g. through providing a heat sink, cooling, orheating.

Mechanical connections between adjacent display elements and betweendisplay elements and substrate may be formed by adhesives of varioustypes, depending on the material(s) used in the display elements.Mechanical connections may also be formed by causing the material of thedisplay elements themselves to bond or adhere together. Such bonding oradhesion could be produced by applying heat, chemical treatment,pressure (for example, either steady or intermittent pressure, orultrasonic pulses) to form connections between display elements. Suchconnections may be based on melting or sintering of display elementmaterials, chemical bonding, cross linking, and various other processes,as known to those of skill in the relevant arts. Electrical or opticalconnections may require the alignment of contact regions (which mayoccur simultaneously with self-organization of display elements) andformation of an electrical or optical connection, by suitable processesas listed above or other processes known to those of skill in therelevant arts.

Groups of associated display elements may be connected to the substrateon which they were initially formed into an array, as described above,and illustrated in FIGS. 11 and 12. Display elements may be connected tothe substrate either before, at the same time as, or after they areconnected to other display elements. Alternatively, connected groups ofdisplay elements may rest upon and be supported by a substrate withoutbeing connected to the substrate, as illustrated in FIG. 10C. In someembodiments, connected groups of associated display elements may beremoved from a substrate as a unit, and transferred to a different(destination) substrate. Connected groups of associated display elementstransferred to a destination substrate may be connected to thedestination substrate or simply rest upon and be supported by thedestination substrate. In some applications, this may allow the originalsubstrate to be optimized for self assembly, re-used and/or otherwisetreated independently of the supporting destination substrate.

In FIG. 13A, connected display element array 220 is lifted from firstsubstrate 10, and transferred to destination substrate 240. Connecteddisplay element array 220 may be transferred by various methods, theselection of which will depend on the size and stability of connecteddisplay element array 220. In FIG. 13B, connected display element array220 rests on and is supported by substrate 240. Depending on the sizeand rigidity of the connected display element array, it may be liftedand dropped from one substrate and transferred to another (as depictedin FIGS. 13A and 13B) by various methods, either by lifting from belowor above. Lifting from above may be accomplished by adhering the displayelement array temporarily to a lifting structure by various means, e.g.a vacuum, static electrical force, magnetic force, surface tension, areleasable adhesive, etc. The connected display element array may belifted from below by a ‘spatula’ or ‘forklift’ type mechanism. As afurther alternative, the connected display element array may be slid offof one substrate and onto the other.

As shown in FIG. 13C, after connected display element array 220 has beentransferred to destination substrate 240, connected display elementarray 220 may be connected to destination substrate 240. Connection 242between connected display element array 220 and destination substrate240 may be formed by various methods, as described previously inconnection with FIGS. 10-12. The most appropriate choice of method forforming connections will be dependent on the nature of the displayelements used to form the display element array.

FIG. 14A-FIG. 14D illustrate the assembly of display elements into anarray using a liquid as a substrate. For ease of use of a liquid as asubstrate, density and chemical properties (especially surface tension)of the liquid are selected appropriately with respect to the density andchemical properties of the display elements, so that display elementsmay float on top of the liquid and be capable of moving about on thesurface of the liquid and forming preferred associations with otherdisplay elements.

In one exemplary embodiment, water or an aqueous solution is used as theliquid, and the display elements having densities lower than water areused. Lower surface of the display elements may be mildly hydrophilic,while sides and upper portions may be hydrophobic, thus promotingcorrect up-down orientation of display elements. Sides of displayelements may have additional characteristics that promote preferredassociations to be formed between different display elements.

An initial stage in which display elements 250 are disposed on surface252 of liquid 254 is depicted in FIG. 14A. In FIG. 14B, display elements250 have self-organized into an array 256 of display elements arrangedin preferred associations. Appropriately selected display elementsurface properties (e.g., hydrophobic sides) make groups of displayelements 250 energetically favored relative to isolated display elementson the surface of the liquid. As shown in FIG. 14C, the grouped displayelements may be transferred to substrate 260 by lowering substrate 260into liquid 254, and lifting it up through self organized array 256 sothat it adheres to at least a portion of the surface of the substrate260 to form a coating 262 made up of display elements 250 in a selforganized array, as depicted in FIG. 14D.

The method depicted in FIGS. 14A-14D may be useful for forming displayelement arrays on non-planar substrates, but also may be used with anysubstrates having suitable surface properties. Display elements thathave self-organized into a display element array on the surface of aliquid and are subsequently transferred to a substrate may be adhered toeach other and/or to the substrate by various methods, as describedpreviously in connection with other embodiments.

Display elements may be made up of one or more light emitting elementsand a carrier which houses, supports, contains, or surrounds the lightemitting element(s). A display element suitable for assembly intomulticolor displays having a plurality of elements may include a lightemitting element capable of emitting light in respective rangecorresponding to one or more of the colors of the display and a carrierin which the light emitting element is housed. The carrier may becharacterized by at least one surface or shape property, or acombination of shape and surface properties. The carrier thus providesthe surface or shape properties that are characteristic of the displayelement. The carrier may have defined shape or surface properties,selected to preferentially locate the display element with respect toother display elements in a desired color pattern to form a multicolordisplay. The display element may include at least one contact forforming an electrical or optical connection with a substrate or anotherdisplay element. The display element may include a radio receiver forreceiving an RF control signal. The display element may include a powersignal input. The power signal input may include a receiver coil forreceiving power inductively. The power signal input may receive power byvarious methods, and is not limited to any particular type of powerinput. Some further examples include photovoltaic, fluorescent, andelectrochemical delivery of power. The display element may include abattery or other power source.

Light emitting elements may be organic or inorganic wavelengthconverters, phosphors, fluors, laser diodes, light emitting diodes,organic light emitting diodes, polymer light emitting diodes, quantumdots, polymers, electroluminescent and chemoluminescent devices, ornonlinear optical materials. Light emitting elements may be capable ofemitting light in a wavelength band corresponding to one or more colors,responsive to a control signal. Light emitting elements may emit lightin response to an electrical control signal (e.g., current or voltage),an electromagnetic control signal (e.g., an electron beam or incidentlight). Various types of display elements may be used in the differentembodiments. Display elements may include light emitting elements insome embodiments. In some embodiments, display elements may includeother forms of light modulating elements having light spectralcharacteristic, and not limited to light emitting elements. For example,other types of display elements may absorb, reflect, scatter, orotherwise modulate or modify light impinging on the display to provide aparticular visually detectable effect on the display, in which casedisplay elements have a characteristic light absorption spectrum orlight reflection spectrum, instead of or in addition to a light emissionspectrum.

In one exemplary embodiment shown in FIG. 15, display element 300includes light emitting element 302 and carrier 304. Carrier 304 mayinclude recess 306 into which the light emitting element 302 is placedsubsequent to manufacture of the light emitting element and the carrier,as shown in FIG. 15. In this embodiment, display elements 300 includeelectronic circuitry 305. Power and control signals may be delivered vialines 320 and 322 respectively, in substrate 314. Each display element300 includes electrical contacts 310 in carrier 304 which can beconnected to contacts 312 in substrate 314 for making connectionsbetween display element 300 and substrate 314. As depicted in FIG. 15,light emitting element 302 may be formed separately from carrier 304.Light emitting element 302 fits into recess 306 in carrier 304, wherecontacts 316 on light emitting element 302 and contacts 318 in recess306 form a connection by which signals used to activate light emittingelement 302 to produce light can be delivered. Light emitting element302 and carrier 304 may be produced by standard fabrication techniques,including for example, injection molding of a plastic body around asemiconductor-based light emitting element.

FIG. 16 depicts an alternative embodiment of a display element 400 inwhich light emitting element 402 is formed integrally with carrier 404.Carrier 404 may be a silicon structure in which semi-conductor basedelectronic circuitry has been formed. Light emitting element 402 may be,for example, a light-emitting diode or laser diode, either of which canbe formed in an integrated semiconductor device. Contacts 406 mayprovide for the transmission of power and/or control signals betweendisplay elements 400.

In some embodiments the light emitting element is formed integrally withthe carrier and no clear distinction can be made between displayelement, light emitting element, and carrier, the carrier feature of thedisplay element residing in the surface characteristic of the externalportion. The carrier may include or be formed from a polymeric material,a semiconductor material, or other materials. The light emitting elementmay be formed integrally with the carrier, or it may be formedseparately from the carrier and subsequently integrated into thecarrier. In one approach, the body forming material may itself include alight emitting properties. For example, all or a portion of the body maybe formed from a light emitting material such as that used in organicLEDs.

In another embodiment, depicted in FIG. 17, a display element 500 (e.g.,500 a, 500 b, 500 c, or 500 d) may include light emitting element 502and carrier 504. Carrier 504 may take the form of a coating applied tothe exterior of light emitting element 502. Carrier 504 may be appliedto light emitting element 502, for example by dipping the light emittingelement 502 into a material that will form carrier 504, by spraying amaterial that will form carrier 504 onto the light emitting element, orby other methods known in the art. Carrier 504 may include or be formedof one or more materials with a surface property that promotesself-organization of display element 500 with other display elements.

These and other methods of forming light emitting elements may includemulti-step processes, including a separate step of applying or forming asurface characteristic on one or more selected regions of the carrier.This step may be performed before or after the carrier and lightemitting element have been joined together. Methods of applying orforming surface characteristics may themselves be multi-step processes(e.g., methods of attaching biomolecules to surfaces as referenced inMontemagno and Bachard, Nanotechnology, Vol. 10, pp. 225-231, 1999;Chung et al., Small, Vol. 1, pp. 1-5, 2005; Published U.S. PatentApplication US 2004/0023414 A1; and U.S. Pat. No. 6,809,196, all ofwhich are incorporated herein by reference).

In the embodiment of FIG. 17, display elements 500 a, 500 b, and 500 care supported on a substrate 530 having a non-planar surface. Threedistinct types of display elements (500 a, 500 b, and 500 c) aredepicted. Each display element 500 (of which display elements 500 a, 500b and 500 c are specific cases) include light emitting element 502surrounded by carrier 504. Light emitting element 502 includes lightsource 520, control circuitry 522, a transceiver 524, and a power source526. Different display element types are characterized by differentlight source; e.g. light source 520 a in display element 500 a emitslight of wavelength band λ_(a), light source 520 b in display element500 b emits light of wavelength band λ_(b), and light source 520 c indisplay element 500 c emits light of wavelength band λ_(c). Carrier 504has one or more surface characteristics that enable each display element500 to form preferred associations with display elements of other types.For example, display element 500 a includes first surface property 506and third complementary surface property 508, display element 500 bincludes second surface property 510 and first complementary surfaceproperty 512, and display element 500 c includes third surface property514 and second complementary surface property 516. As illustrated inFIGS. 1-3, first, second and third surface properties 506, 510, and 514,associate preferentially with their complements, first, second and thirdcomplementary surface properties 512, 516, and 508, respectively, toproduce self organization of display elements 500 a, 500 b, and 500 cinto a preferred arrangement. Because display elements 500 a, 500 b, and500 c include power source 526 and transceiver 524, connections betweendisplay elements 500 and between display elements 500 and substrate 530are not required to provide for the transmittal of power or data, andmay only provide mechanical support and/or spatial positioning.Transceiver 524 allows data and control signals to be sent betweendisplay elements 50 and external control circuitry without electricalconnections between display elements. Power source 526 may be a batteryor other power generating or collecting device or structure, such as aphotovoltaic cell, an inductive coil, an antenna, or an energyscavenging device. In certain embodiments, power source 526 may be afrequency-shifting or energy-conversion device, such as a fluor orphosphor.

As described above, display elements may be connected to each other orto a substrate by application of one or more of heat, vibration,pressure, chemical treatment, or an adhesive. Connecting groups ofassociated display elements or individual display elements to each otheror to a substrate may include forming connections for transmitting dataor power. Such connections may include electrical or opticalconnections. As an alternative to direct (mechanical, electrical, oroptical) connections, power, data, or control signals may be transmittedto display elements via remote or wireless connections. Display elementsmay include transmitters, receivers, or transmitter-receiver(transceiver) combinations for sending RF or other signals. Power may betransmitted to display elements by various methods, including inductivecoupling or power beaming, as well as via direct electrical connections.

Display elements may be responsive to one or more control signals.Control signals may include electrical signals transmitted viaelectronic circuitry, electromagnetic signals transmitted to displayelements via a transmitter and received by a receiver (or transceiver),optical signals delivered via optical circuitry or electromagneticsignal. In some embodiments, control signals may be transmitted viachemical, electrochemical, and/or biochemical signaling. A controlsignal may produce emission of light by a light emitting elementdirectly (e.g., in the case of an electron beam, UV beam, or otherenergy striking a phosphor to cause emission of light) or a controlsignal may be processed by electronic or optical circuitry on the lightemitting element to control light emission indirectly, in which case thecontrol signal may initiate, stop, or otherwise modulate the emission oflight by light emitting elements. Such modulation may include variousother modifications, as may be devised by those of skill in the relevantarts, including, but not limited to, shifting light direction orpolarization, modulating light spectral properties, or modulating apulse-repetition pattern.

A variety of approaches to selectively activating individual elements,or groups of elements may be implemented. In a straightforward N×N orM×N array of elements, conventional row and column addressing, such asthat found in many matrix array structures, such as LCDs may beappropriate. The control electronics and tradeoffs for such addressingand selective activation are known to one of skill in the art.

FIG. 18 illustrates a process for forming a self-organized array andestablishing the location of specific display elements within theself-organized array. This process may be used in systems in whichdisplay elements have individual identifiers (e.g., identification codesor numbers) and are controlled by wireless control signals, thoughmodifications of the approach may applied for systems with connectionsother than wireless. The location of specific display elements must bedetermined after the display elements have self-organized into thearray. At step 602, display elements 1 through N are allowed toself-organize. At step 604, display elements 1 through N are secured infixed relationship to one another. Subsequent steps are carried out fordisplay elements 1 to N, as controlled at step 606 (or by an equivalentcontrol loop). At step 608, a wireless control signal containing theinstruction “Activate display element n” is sent to all displayelements. At step 610, the location of activated display element n,designated by loc(n), is detected. At step 612, loc(n) is stored in thememory of a controller, along with the identifier n. Process controlreturns to step 606, and steps 608 through 612 are repeated for allvalues of n between 1 and N. When steps 608 through 612 have beenrepeated for all values of n, training or configuration of the system iscomplete, and use of the system may commence as represented by step 614.At step 614, a display element at a desired location loc(n) is activatedby sending a wireless control signal containing the instruction“Activate display element n.” Suitable wireless control signals may besent out for as long as desired to activate one or more display elementsat a time in a desired pattern.

FIG. 19 outlines a process for designing display elements to formself-organizing arrays. At step 652, a set of light emitting elementscapable of emitting light of different selected wavelength bands isselected. Using the embodiment of FIGS. 1-3 as an example, this stepwould involve selecting a first display element type 20, second displayelement type 30, and third display element type 40, selected to providelight in a red wavelength band, green wavelength band, and redwavelength band, respectively. In some cases, display element sets mayinclude display elements that differ not by color, but by some otherfunctional characteristic: for example, a display element set mightinclude two different display elements that emit red light, one emittinglight in a narrow wavelength band and one emitting light in a broadwavelength band. Display elements may be distinguished from each otherby various other characteristics, of which the following are onlyexemplary: intensity of emitted light, power consumption, size, shape,wavelength band envelope, spectral width, spectral brightness, power,emission pattern (e.g. pulse repetition rate), polarity, response speed,and linearity. Moreover, as noted previously, display elements may havea characteristic spectral response that is not based upon lightemission.

Next, at step 654 of FIG. 19, the preferred arrangement of lightemitting elements relative to other light emitting elements isdetermined. The set of light emitting elements may include as many lightemitting elements as are needed to form the basic pattern elementrepeated in the array. For example, in the embodiment depicted in FIGS.1-3, the preferred arrangement of light emitting elements is triad 60,which may be arranged in a repeating pattern of array 50. The ‘set’ oflight emitting elements includes display elements 20, 30, and 40.Display element types 20, 30, and 40 have surface properties selected topromote their association into triads 60 and array 50, as describedpreviously. It should be noted that basic pattern elements formed by aset of display elements (of which triad 60 is one example) need notcontain only a single copy of each display element type. For example, insome embodiments that employ red, green, and blue subpixels, it may bedesirable to include two blue display elements for each red and greenelement. It would also be possible to form a basic pattern element thatincludes multiple copies of some or all display element types.

At step 656, a carrier is designed for each light emitting element,which has shape and surface characteristics that promote selforganization of the light emitting elements into the preferredarrangement relative to other light emitting elements. For theembodiment of FIGS. 1-3, this step would include selecting surfacecharacteristics at specific surface regions on each display elementtype.

In some embodiments, a method of designing a set of display elementsincludes selecting a set of light emitting elements, each of which iscapable of emitting light of respective selected wavelength, anddetermining a preferred arrangement of the light emitting elements. Itshould be noted that, while reference is made to “light emitting”elements, in some embodiments, elements which modulate light in someother way to produce a visually detectable effect (e.g., by lightreflection, refraction, scattering, or absorption) may be used in placeof light emitting elements. The preferred arrangement specifies theposition of light emitting elements capable of emitting light of each ofsaid selected wavelength bands relative to light emitting elementscapable of emitting light of other selected wavelength bands. The methodfurther includes designing an attribute set for each light emittingelement of the set of light emitting elements, where each attribute setis adapted to promote self-organization of the set of display elementsaccording to the preferred arrangement. The set of light emittingelements according to the method may include a plurality of types oflight emitting elements in which each type of light emitting element ischaracterized by a respective attribute set and is capable of emittinglight of a respective selected wavelength band. According to thepreferred arrangement, certain types of elements are attracted to andassociate with certain other types of elements. In many cases, elementsmay be attracted to elements different than their own type. Certaintypes of elements may be repelled from and avoid associating withcertain types of elements. In certain embodiments, elements may berepelled from and avoid associating with elements that are of the sametype.

FIG. 20 illustrates a self organized display element array 700 thatincludes a display element set 702 shaded area). Each display element704, 706, and 708, in display element set 702 includes multiple lightemitting elements. In this example, each display element includes twolight emitting elements of the same color which may, however, differ interms of waveband or other characteristics. For example, R₁ emits broadwaveband red light, while R₂ emits red light in a narrow waveband.Alternatively, R₁ and R₂ may be identical light emitting elements thatare included in duplicate to provide redundancy, so that if one lightemitting element fails, the other may serve as a backup. In anotheralternative, two identical light emitting elements may be included toprovide a broader range of light intensities. In still anotherembodiment, two light emitting elements may emit light in bands havingdifferent central peaks. This may allow greater spectral coverage, oruse of less expensive components while still providing light in a usablerange.

FIG. 21 depicts a display element array 800 including display elementset 802 (indicated by the shaded area), which includes display elementsof four different types, 804, 806, 808, and 810. In this example,display elements 804 emit light in a first wavelength band, displayelements 806 emit light in a second wavelength band, and displayelements 808 and 810 emit light in a third wavelength band. Displayelements 808 and 810 emit light of the same wavelength band but differin another characteristic, e.g. power consumption, life span, etc.

The preferred arrangement may include a pattern having short-rangeorder, a repeating pattern, or a pattern having long-range order.Patterns having either short-range order or long-range order mayincorporate repeating patterns. In an embodiment particularly suited forthe design of three color displays, such as are commonly used intelevision or computer screens, three distinct types of display elementsthat self-organize into triads are used. Each triad may include at leastone red display element, at least one green display element, and atleast one blue display element. In certain embodiments, sets of lightemitting elements may include between two and ten different types oflight emitting elements. According to one embodiment, sets of displayelements are provided that are suitable for assembly into a multicolordisplay.

Each set of display elements may include a first set of light emittingportions having a first wavelength response and a first set of bodyportions each carrying a respective one or more of the light emittingportions in the first set of light emitting portions. Each body portionin the first set of body portions may have a first defined physicalfeature corresponding to the first wavelength response. The set ofdisplay elements may also include a second set of light emittingportions having a corresponding second wavelength response and a secondset of body portions, each carrying a respective one or more of thelight emitting portions in the second set of light emitting portions.Each body portion in the second set of body portions may have a seconddefined physical feature corresponding to the second wavelengthresponse. The first defined physical feature is configured topreferentially associate with the second defined physical feature.Specifically, the first defined physical feature is configured topreferentially associate its respective body portion adjacently with abody portion in the second set of body portions.

Sets of display elements are not limited to any specific number of typesof display elements, any number of display elements from only two to asmany as ten or more different types of light emitting elements.

FIG. 22 illustrates a display element array 900 in which the displayelement set 902 forming the basic pattern element includes a total ofseven display elements, of which two (904 and 906) include the same typeof light emitting or light modulating element (indicated by referencenumber 2). The remaining five display elements (908, 910, 912, 914, and916) include display elements of different types (indicated by referencenumbers 1, 3, 4, 5 and 6, respectively).

In some embodiments, a multicolor display includes a plurality ofdisplay elements in a self-organized array, in which the plurality ofdisplay elements includes two or more colors of display elements thatare self-organized by color. Each display element may have at least onenearest neighbor that is of a different color. Display elements of eachcolor are characterized by at least one surface or shape property thatpromotes association of the display elements with other display elementsof different colors and inhibits association of display elements withother display elements of the same color.

Design of display element sets for constructing self-organizing displaysmay include the design of substrates to operate in cooperation withdisplay elements. Displays according to various embodiments may includea substrate on which a self-organized array of display elements isdisposed. The substrate may have a planar or non-planar surface. Displayelements may be attached to the substrate, or may simply rest upon andbe supported by the substrate. The substrate may have a surfacecharacteristic or property that interacts with a surface characteristicof at least some of the display elements to influence the orientation ofdisplay elements on the surface or distribution of display elements onthe surface. Surface characteristics that may influence the orientationof display elements may include, but are not limited to, chemicalcomposition, electric charge, surface energy, magnetic, shape or texturecharacteristics. The substrate may include electrical circuitry andcontacts for sending power or data signals to one or more displayelements disposed on its surface. The substrate may include opticalcircuitry and optical connections to display elements on its surface.Choice of substrate is strongly dependent on the intended application ofthe display element array, though general design principles apply tosubstrate and display elements across applications.

Self organizing and/or self-assembling display element arrays asdisclosed herein may find application in a wide variety of devices andsystems.

FIG. 23 depicts application of a self-organizing display element array1000 in computer monitor 1002.

FIG. 24 depicts application of a self-organizing display element array1010 in a television screen 1012. It is increasingly the case that thereis little distinction between television screens and computers monitors,as televisions include more interactive capabilities, and televisionscreens include capabilities for displaying images in multiple windows,displaying menu option, and so forth.

FIG. 25 illustrates the use of self-organized display element arrays ona sign 1020. The example presented in FIG. 25 includes a static displayportion 1022 that may be configured to display a static image 1024 (inthis case, the text “Café & Billiards”), while dynamic display portion1026 may be configured to display a message or image 1028 that may bechanged at intervals. If desired, the dynamic display portion maydisplay a continuously changing message or image (e.g. scrolling text oranimated image). Static display portion 1022 and dynamic display portion1026 may differ with regard to type and distribution of displayelements, or with regard to the control signals used to control thedisplay elements. Signs (and related displays, such as labels,advertisements, billboard, etc., which may also incorporate embodimentsof the present invention) may be entirely static, or entirely dynamic,depending on their intended use. Sign 1020 may include battery 1030 andcontrol circuitry 1032 mounted in or on sign 1020 for driving operationof static display portion 1022 and dynamic display portion 1024.

Self organized display element arrays may also be used on items ofapparel, or other decorative or function items formed of flexible fabricor material. As an example, FIG. 26 illustrates the use of aself-organized display element array on a baseball cap 1050. Baseballcap 1050 includes panel 1052 containing display element array 1054,which may be a flexible array. Text, images, or patterns, which may beeither static or dynamic, may be displayed on display element array1054. In the example shown in FIG. 26, display element array 1054displays text 1056, reading “GO TEAM!” Display element array 1054 may bepowered by various methods. As shown in FIG. 26, a small battery 1058may be mounted on cap 1050 in an inconspicuous location (e.g, in theinterior of cap 1050) and connected to display element array 1054 vialead 1064. Alternative power supplies may be used instead, e.g., a solarcell. Controller 1060, which may be an ASIC or a microprocessor baseddevice may be mounted on cap 1050 and connected via one or more datalines 1062 to display element array 1054 to drive operation of displayelement array 1054.

FIG. 27 illustrates the use of a self-organized display element assemblyon a decorative item having a non-planar substrate, in this example, avase 1200 bearing a panel 1202 displaying the message “Get well soon”.The message “Get Well Soon!” may alternate with one or more othermessages or images, may scroll across the panel, may flash, or mayproduce various other visual effects. Such variations of displays may beapplied to any other embodiments in which a dynamic display elementarray, including but not limited to the examples presented herein. Vase1200 may incorporate a battery or other power supply and controlcircuitry, as discussed in connection with the baseball cap embodimentdepicted in FIG. 26.

Self organizing display element arrays may be used in virtually anysetting in which it is desired to graphically display static or dynamictext, images, or patterns on a surface. As discussed previously, dynamicdisplays may be varied at intervals (for example, dynamic displayportion 1026 in FIG. 25 may be changed from “Closed—Come back Soon” to“Open—Come on In”), or may be varied continuously to display scrollingor flashing text, animated graphic, or various other dynamic displays asmay be devised by those of skill in the relevant arts. Display elementsmay be of a wide range of sizes, and display element arrays or displaysformed from such display elements may be of a wide range of sizes andresolutions, depending on intended application and construction methodand materials. Text, images, and patterns formed through the use of suchdisplays may be informative, decorative, or functional. Such displaysmay be used in or on a wide variety of decorative and/or functionalitems, to convey information or to change the appearance of an item in afunctional manner (e.g., camouflage on a vehicle or item of clothing),or to present a desired decorative appearance on various items (objects,items of apparel, etc., signs, labels, artwork.)

FIGS. 28A-28D illustrate the manufacture of a display having severalregions containing self-organized display element arrays of differenttypes. In the example depicted in FIGS. 28A-28D, display 1300 includes afirst display region 1302 on a substrate 1301, which defines a faceportion of a “smiley face”. First display region 1302 is surrounded bybarrier 1304. Two eye portions 1306 and mouth portion 1308 are set offfrom first display region 1302 by barriers 1310 and 1312, respectively.Second display region 1314, which forms a background to the smiley face,is separated from first display region 1302 by barrier 1304 and boundedby barrier 1316. In FIG. 28A, a first plurality of display elements1318, in a quantity sufficient to fill first display region 1302, isadded to first display region 1302 from dispenser 1320. In FIG. 28B, asecond plurality of display elements 1322, in a quantity sufficient tofill second display region 1314, is added to second display region 1314from dispenser 1324. First plurality 1318 and second plurality 1322 ofdisplay elements may differ in one or more characteristics. Eachplurality may be formed of a single type of display element, or two ormore different types of display elements. For example, the firstplurality may be made up of display elements of a first color (e.g.,yellow), while the second plurality may be made up of display elementsof a second color (e.g. blue). Alternatively, one or both of the firstand second plurality may be made up of multiple types of displayelements, for example, the first plurality may be made up of a mixtureof orange and yellow display elements, while the second plurality ofdisplay elements may be made up of a mixture of green and blue displayelements. As another alternative, the first and second plurality mayinclude display elements of the same types in different proportions, forexample, the first plurality may include one-third red display elements,one-third blue display elements, and one-third green display elements,while the second plurality may include half red display elements, andone quarter each of blue display elements and green display elements.

Display elements may differ by other characteristics than color, e.g.,size, power consumption, spectral waveband, etc., and may differ by oneor by multiple characteristics. The choice of display elements used ineach region may be based on the text, pattern, or image that is to bedisplayed. If the display is intended to display a fixed pattern (e.g.,the smiley face depicted in FIGS. 28A-28D) the display elementcharacteristics may be selected to be suitable for the pattern. Forexample, the face portion of the smiley face may be yellow, and thebackground blue. The eyes and mouth portions may be black (in which casethere may be no need to provide display elements that emit light inthese portions). In the sign as depicted in FIG. 25, static displayportion 1022 may include a first mixture of display elements suitablefor displaying the intended static image or text, while the lowerportion may include a different assortment of display elements, e.g.,larger display elements in a single color, suitable displaying theintended basic text but insufficient for displaying an image or moreelaborate text.

Returning to FIG. 28B, following loading of display elements into firstdisplay region 1302 and second display region 1314, the system may beagitated to cause the display elements to self organize to form displayelement arrays within their respective display regions. FIG. 28Cillustrates display 1300 following formation of self organized displayelement arrays within first display region 1302 and second displayregion 1314. Barriers 1310, 1312, and 1316 remain in place between thedifferent regions of display 1300. Display elements may be secured toeach other and to substrate 1301 either before or after removal ofbarriers 1310, 1312, and 1316, depending on the specific types ofdisplay elements and substrate used. Barriers 1310, 1312 and 1316 may beremoved from the completed display 1300, as depicted in FIG. 28D.Alternatively, in some embodiments, barriers between display portionsmay form a part of the completed display.

FIGS. 29A and 29B illustrate a method of forming a non-uniformdistribution of display elements on a substrate. In FIG. 29A, a firstquantity of display elements 1400 (which may include a first mixture ofdisplay elements) is disposed onto substrate 10 from dispenser 1402during a first time interval t₁. First quantity of display elements 1400may have physical characteristics (size, surface properties, density,etc.) that cause first quantity of display elements 1400 to spread outonto substrate 10 or may be in a mixture (e.g., with a liquid, gas orsolid) that confers suitable spreading properties to first quantity ofdisplay elements 1400. In FIG. 29B, a second quantity (type or mixture)of display elements 1404 is disposed onto substrate 10 from dispenser1402 during a second time interval t₂. Second quantity of displayelements 1404 spreads out onto substrate 10, causing further outwardspreading of first quantity of display elements 1400. The approachillustrated in FIGS. 29A and 29B exemplifies how a spatially non-uniformdistribution of display elements on a substrate may be obtained bydistributing different types or mixtures of display elements to the samelocation of a substrate at different times.

FIG. 30 illustrates how display elements may be delivered to a substratesurface at two or more locations, by the use of multiple deliverydevices. First quantity of display elements 1450 is delivered to firstlocation 1452 on substrate 10 from first delivery device 1454. Secondquantity of display elements 1456 is delivered to second location 1458on substrate 10 from second delivery device 1460. Substantially the sameresult could be obtained by using a single delivery device and movingthe delivery device (which may be, for example, nozzle, spout, inkjet,pressure jet, sprayer, etc.) with respect to the substrate, or movingthe substrate with respect to the delivery device. By deliveringdifferent display elements (i.e., different types of display elements ormixtures of the same types of display elements in different proportions)at the different locations, a spatially non-uniform distribution ofdisplay elements on the substrate may be obtained.

Various of the exemplary embodiments disclosed herein (e.g., in FIGS.1-3, 6, and 20-22) include display elements arranged in regular,rectilinear N×N or M×N arrays. However, as used herein, the term“display element array” applies not only to regular, rectilinear arrays,but also to arrays formed from various other associations of displayelements, including arrangements of display elements that arenon-uniform with respect to various parameters, including, but notlimited to spacing, orientation, size, and type of display elements. Asillustrated in FIGS. 28, 29, and 30, display element arrays may includetwo or more distinct regions, configured so that within each region thedisplay element array is regular and uniform, but between regions andacross the display element array as a whole, there is a non-uniform,irregular distribution of display elements. Display element arrays mayalso include arrangements of display elements that do not includeuniform regions but are non-uniform as a whole. Non-uniformdistributions may include gradients with respect to display elementsize, color, etc., for example, running from one side of a displayelement array to another, or from the center of a display element arrayto the edges. Non-uniform display element arrays may be non-uniform buthave a statistical distribution of display elements over some or all ofthe array. In certain embodiments, spatial distribution of displayelements over an array may be random or quasi-random.

FIG. 31 illustrates a display element array 1500 having a substantiallyrandom distribution of display elements of types 1510 and 1520. FIG. 31also illustrates the use of spacer elements 1530 within display elementarray 1500. In general, spacer elements are elements of a displayelement array may not themselves function as display elements, withregard to emitting or modulating light, but which may be positionedbetween other display elements to modulate the spacing of other displayelements within the array. In some embodiments, an individual spacerelement may be characterized by at least one surface or shape propertythat promotes association of the spacer element with display elementssuch that the spacer element moves to a preferred location with respectto the display elements within a preferred arrangement of displayelements. In other embodiments, as illustrated by the exemplaryembodiment in FIG. 31, display elements 1510 and 1520 may be distributedsubstantially randomly across display element array 1500, as are spacerelements 1530. Display element array 1500 does not include a specific“preferred arrangement” of display elements that forms a basic repeatingunit of display element array 1500. However, the size, shape, and/orsurface properties, as well as the relative proportions, of displayelements 1510 and 1520 and spacer elements 1530 cause display elementarray to have an average distribution of display elements of differenttypes across display element array 1500. Spacer elements 1530interspersed between display elements 1510 and 1520 increase the meandistance between display elements.

FIGS. 32A-32C illustrates a method of replacing defective ornon-functional display elements. Display elements may be considereddefective if they are partially or fully non-functional, functional butnot connected properly, not positioned properly, or of the wrong typefor the position in the array. The method may apply to single displayelements or groups of display elements. The method may be used duringthe initial manufacture of the display element array, in connection withtesting or troubleshooting, or may be adjusted for use post-manufacture,e.g., in the repair of damaged or worn out display element arrays. FIG.32A, illustrates display element array 1600, made up of multiple displayelements 1602, 1604, and 1606, of three different types, r, g, and b,respectively. Shaded display element 1608 is a defective display elementof the ‘b’ type. In FIG. 32B depicts display element array followingremoval of defective display element 1608 as well as a number ofadjacent display elements. Suitable methods for removing displayelements from an assembled array will depend on the size and type ofdisplay elements, and will be known by those of skill in the art. In thecase of small display elements, a moistened probe, for example, may betouched to the assembled array in the region of interest, and displayelements may adhere to the probe by surface tension so they may belifted from the assembled array. FIG. 32C. illustrates display elementarray 1600 following a repair process. Void 11 in FIG. 32B has beenfilled by replacement portion 1612. Defective display element 1608 hasbeen replaced by replacement display element 1614, which is of thecorrect type.

FIG. 33 outlines a subset of the steps of the method illustrated inFIGS. 32A-32C, incorporated into the method of manufacturing a displayor repairing a previously manufactured display. At step 1702, aplurality of display elements of a plurality of types are disposed ontoa substrate, each of the plurality of types of display elements beingconfigured to form preferred associations with one or more other typesof display elements with a degree of preference that depends upon thetypes of display element. At step 1704, relative movement of displayelements and the surface sufficient to produce association of at least aportion of the display elements with other display elements to form agroup of associated display elements is induced. The induced movement issufficient to permit the display elements to self-organize to formpreferred associations within the group of associated display elements.At step 1706, at least a portion of the group of associated displayelements are tested to detect at least one defective display element. Atstep 1708, at least one defective display element is removed. Followingstep 1708, the array is in the state depicted in FIG. 32B, ready to havedefective element(s) replaced.

FIG. 34 outlines another portion of the process for replacing defectivedisplay elements, beginning with testing at least a portion of a groupof associated display elements to detect at least one defective displayelement at step 1722. At step 1724, at least one defective displayelement is removed from the group of associated display elements. Morethan one display element may be removed. If a group of display elementsis removed which contains at least one defective display element, someof the removed display elements may not be defective. Following step1724, the array is in the state depicted in FIG. 32B. The repair orreconstruction of the array proceeds as follows: at step 1726, aplurality of replacement display elements of a plurality of types aredisposed onto the group of associated display elements. Each of theplurality of types is configured to form preferred associations with oneor more other types of display elements in the group of associateddisplay elements and the plurality of replacement display elements, witha degree of preference that depends upon the type of display element.The plurality of replacement display elements may be at least sufficientin number to fill the void left in the group of associated displayelements by removal of the defective display element or elements. Atstep 1728, relative movement of the replacement display elements and thegroup of associated display elements is induced which is sufficient topermit self-organization of the replacement display elements to formpreferred associations within the group of associated display elements.At step 1730, the group of associated display elements, now includingone or more replacement display elements in place of the removed displayelements, are connected in fixed relationship to each other.

With regard to the hardware and/or software used in the control ofdisplays according to the present image, and particularly to the controlof light generation by display elements within such displays, thosehaving skill in the art will recognize that the state of the art hasprogressed to the point where there is little distinction left betweenhardware and software implementations of aspects of such systems; theuse of hardware or software is generally (but not always, in that incertain contexts the choice between hardware and software can becomesignificant) a design choice representing cost vs. efficiency orimplementation convenience tradeoffs. Those having skill in the art willappreciate that there are various vehicles by which processes and/orsystems described herein can be effected (e.g., hardware, software,and/or firmware), and that the preferred vehicle will vary with thecontext in which the processes are deployed. For example, if animplementer determines that speed and accuracy are paramount, theimplementer may opt for a hardware and/or firmware vehicle;alternatively, if flexibility is paramount, the implementer may opt fora solely software implementation; or, yet again alternatively, theimplementer may opt for some combination of hardware, software, and/orfirmware. Hence, there are several possible vehicles by which theprocesses described herein may be effected, none of which is inherentlysuperior to the other in that any vehicle to be utilized is a choicedependent upon the context in which the vehicle will be deployed and thespecific concerns (e.g., speed, flexibility, or predictability) of theimplementer, any of which may vary. Those skilled in the art willrecognize that optical aspects of implementations will requireoptically-oriented hardware, software, and or firmware.

The foregoing detailed description has set forth various embodiments ofthe devices and/or processes via the use of block diagrams, flowcharts,and/or examples. Insofar as such block diagrams, flowcharts, and/orexamples contain one or more functions and/or operations, it will beimplicitly understood by those with skill in the art that each functionand/or operation within such block diagrams, flowcharts, or examples canbe implemented, individually and/or collectively, by a wide range ofhardware, software, firmware, or virtually any combination thereof. Inone embodiment, several portions of the subject matter described hereinmay be implemented via Application Specific Integrated Circuits (ASICs),Field Programmable Gate Arrays (FPGAs), digital signal processors(DSPs), or other integrated formats. However, those skilled in the artwill recognize that some aspects of the embodiments disclosed herein, inwhole or in part, can be equivalently implemented in standard integratedcircuits, as one or more computer programs running on one or morecomputers (e.g., as one or more programs running on one or more computersystems), as one or more programs running on one or more processors(e.g., as one or more programs running on one or more microprocessors),as firmware, or as virtually any combination thereof, and that designingthe circuitry and/or writing the code for the software and/or firmwarewould be well within the capabilities of one of skill in the art inlight of this disclosure. In addition, those skilled in the art willappreciate that certain mechanisms of the subject matter describedherein are capable of being distributed as a program product in avariety of forms, and that an illustrative embodiment of the subjectmatter described herein applies equally regardless of the particulartype of signal bearing media used to actually carry out thedistribution. Examples of a signal bearing media include, but are notlimited to, the following: recordable type media such as floppy disks,hard disk drives, CD ROMs, digital tape, and computer memory; andtransmission type media such as digital and analog communication linksusing TDM or IP based communication links (e.g., links carryingpacketized data).

In a general sense, those skilled in the art will recognize that thevarious aspects described herein which can be implemented, individuallyand/or collectively, by a wide range of hardware, software, firmware, orany combination thereof can be viewed as being composed of various typesof “electrical circuitry.” Consequently, as used herein “electricalcircuitry” includes, but is not limited to, electrical circuitry havingat least one discrete electrical circuit, electrical circuitry having atleast one integrated circuit, electrical circuitry having at least oneapplication specific integrated circuit, electrical circuitry forming ageneral purpose computing device configured by a computer program (e.g.,a general purpose computer configured by a computer program which atleast partially carries out processes and/or devices described herein,or a microprocessor configured by a computer program which at leastpartially carries out processes and/or devices described herein),electrical circuitry forming a memory device (e.g., forms of randomaccess memory), and/or electrical circuitry forming a communicationsdevice (e.g., a modem, communications switch, or optical-electricalequipment).

Those skilled in the art will recognize that it is common within the artto describe devices for displaying or otherwise presenting informationin the fashion set forth herein, and thereafter use standard engineeringpractices to integrate such described devices and/or processes intodisplays or other light emitting or modulating devices as exemplifiedherein. That is, at least a portion of the devices and/or processesdescribed herein can be integrated into a display or other lightemitting or modulating device containing system via a reasonable amountof experimentation.

Those having skill in the art will recognize that such systems generallyinclude one or more of a memory such as volatile and non-volatilememory, processors such as microprocessors and digital signalprocessors, computational-supporting or -associated entities such asoperating systems, user interfaces, drivers, sensors, actuators,applications programs, one or more interaction devices, such as dataports, control systems including feedback loops and control implementingactuators (e.g., devices for sensing position and/or velocity and/oracceleration or time-rate-of-change thereof; control motors for movingand/or adjusting components and/or quantities). A typical display systemmay be implemented utilizing any suitable available components, such asthose typically found in appropriate computing/communication systemsand/or light emitting systems, combined with standard engineeringpractices.

The foregoing-described aspects depict different components containedwithin, or connected with, different other components. It is to beunderstood that such depicted architectures are merely exemplary, andthat in fact many other architectures can be implemented which achievethe same functionality. In a conceptual sense, any arrangement ofcomponents to achieve the same functionality is effectively “associated”such that the desired functionality is achieved. Hence, any twocomponents herein combined to achieve a particular functionality can beseen as “associated with” each other such that the desired functionalityis achieved, irrespective of architectures or intermediate components.Likewise, any two components so associated can also be viewed as being“operably connected”, or “operably coupled”, to each other to achievethe desired functionality.

While particular aspects of the present subject matter described hereinhave been shown and described, it will be obvious to those skilled inthe art that, based upon the teachings herein, changes and modificationsmay be made without departing from this subject matter described hereinand its broader aspects and, therefore, the appended claims are toencompass within their scope all such changes and modifications as arewithin the true spirit and scope of this subject matter describedherein. Furthermore, it is to be understood that the invention isdefined by the appended claims. It will be understood by those withinthe art that, in general, terms used herein, and especially in theappended claims (e.g., bodies of the appended claims) are generallyintended as “open” terms (e.g., the term “including” should beinterpreted as “including but not limited to,” the term “having” shouldbe interpreted as “having at least,” the term “includes” should beinterpreted as “includes but is not limited to,” etc.). It will befurther understood by those within the art that if a specific number ofan introduced claim recitation is intended, such an intent will beexplicitly recited in the claim, and in the absence of such recitationno such intent is present. For example, as an aid to understanding, thefollowing appended claims may contain usage of the introductory phrases“at least one” and “one or more” to introduce claim recitations.However, the use of such phrases should NOT be construed to imply thatthe introduction of a claim recitation by the indefinite articles “a” or“an” limits any particular claim containing such introduced claimrecitation to inventions containing only one such recitation, even whenthe same claim includes the introductory phrases “one or more” or “atleast one” and indefinite articles such as “a” or “an” (e.g., “a” and/or“an” should typically be interpreted to mean “at least one” and/or “oneor more”); the same holds true for the use of definite articles used tointroduce claim recitations. In addition, even if a specific number ofan introduced claim recitation is explicitly recited, those skilled inthe art will recognize that such recitation should typically beinterpreted to mean at least the recited number (e.g., the barerecitation of “two recitations,” without other modifiers, typicallymeans at least two recitations, or two or more recitations).Furthermore, in those instances where a convention analogous to “atleast one of A, B, and C, etc.” is used, in general such a constructionis intended in the sense of one having skill in the art would understandthe convention (e.g., “a system having at least one of A, B, and C”would include but not be limited to systems that have A alone, B alone,C alone, A and B together, A and C together, B and C together, and/or A,B, and C together). In those instances where a convention analogous to“at least one of A, B, or C, etc.” is used, in general such aconstruction is intended in the sense of one having skill in the artwould understand the convention (e.g., “a system having at least one ofA, B, or C” would include but not be limited to systems that have Aalone, B alone, C alone, A and B together, A and C together, B and Ctogether, and/or A, B, and C together).

Although the methods, devices, systems and approaches herein have beendescribed with reference to certain preferred embodiments, otherembodiments are possible. As illustrated by the foregoing examples,various choices of display element and display system configuration maybe within the scope of the invention. As has been discussed, the choiceof system configuration may depend on the intended application of thesystem, the environment in which the system is used, cost, personalpreference or other factors. Display design, manufacture, and controlprocesses may be modified to take into account choices of displayelement components and configuration, and such modifications, as knownto those of skill in the arts of display design and construction, mayfall within the scope of the invention. Therefore, the full spirit orscope of the invention is defined by the appended claims and is not tobe limited to the specific embodiments described herein.

1.-104. (canceled)
 105. A multi-color display comprising a plurality ofdisplay elements in a self-organized array disposed on a substrate;wherein said plurality of display elements is comprised of two or morecolors of display elements self-organized by color so that each saiddisplay element has at least one nearest neighbor that is of a differentcolor; and wherein display elements of each color are characterized byat least one surface or shape property that promotes association ofdisplay elements with other display elements of a different color andinhibits association of display elements with other display elements ofthe same said color.
 106. The multi-color display of claim 105, whereinsaid substrate comprises a planar surface on which said self-organizedarray is disposed.
 107. The multi-color display of claim 105, whereinsaid substrate comprises a non-planar surface on which saidself-organized array is disposed.
 108. The multi-color display of claim105, wherein said substrate comprises a surface having a surfacecharacteristic that influences the orientation of said elements withrespect to said surface.
 109. The multi-color display of claim 105,wherein said substrate comprises a surface having a surfacecharacteristic that influences the spatial distribution of displayelements of different colors with respect to said surface.
 110. Themulti-color display of claim 109, wherein said surface characteristicincludes one or more of a surface charge, surface energy, magneticproperty, binding affinity of a biomolecule, surface shape, or surfacetexture.
 111. The multi-color display of claim 105, wherein saidsubstrate comprises contacts for sending power or data signals to one ormore of said display elements.
 112. The multi-color display of claim105, wherein the color of a display element is determined by its lightemission properties.
 113. The multi-color display of claim 105, whereinthe color of a display element is determined by its light reflectingproperties.
 114. The multi-color display of claim 105, wherein the colorof a display element is determined by its light absorbing properties.115. The multi-color display of claim 105, wherein the color of adisplay element is determined by its light filtering properties. 116.The multi-color display of claim 105, wherein the color of a displayelement is determined by its light scattering properties.
 117. Amulti-color display comprising a plurality of display elements in aself-organized array, each said display element including a lightemitting element responsive to a control signal; wherein said pluralityof display elements is comprised of two or more colors of displayelements self-organized by color so that each said display element hasat least one nearest neighbor that is of a different color; whereindisplay elements of each color are characterized by at least one surfaceor shape property that promotes association of display elements withother display elements of a different color and inhibits association ofdisplay elements with other display elements of the same said color.118. The multi-color display of claim 1117, wherein said light emittingelement is directly responsive to said control signal.
 119. Themulti-color display of claim 1117, wherein said light emitting elementis responsive to said control signal following processing of saidcontrol signal by electronic or optical circuitry.
 120. The multi-colordisplay of claim 1117, wherein said light emitting element emits lightin response to said control signal.
 121. The multi-color display ofclaim 1117, wherein said light emitting element stops emitting light inresponse to said control signal.
 122. The multi-color display of claim117, wherein said control signal includes electromagnetic radiation.123. The multi-color display of claim 117, wherein said control signalincludes an electrical potential or current.
 124. The multi-colordisplay of claim 1117, wherein said control signal includes an opticalsignal.
 125. The multi-color display of claim 117, wherein said controlsignal includes a chemical, electrochemical, or biochemical signal. 126.A multi-color display comprising a plurality of display elements in aself-organized array; wherein said plurality of display elements iscomprised of two or more colors of display elements self-organized bycolor so that each said display element has at least one nearestneighbor that is of a different color; wherein display elements of eachcolor are characterized by at least one surface or shape property thatpromotes association of display elements with other display elements ofa different color and inhibits association of display elements withother display elements of the same said color; and wherein one or moreof said display elements includes a light emitting element capable ofemitting light in a respective range corresponding to one or more of thecolors in response to a control signal and a carrier in which said lightemitting element is housed, said carrier characterized by said at leastone surface or shape property and conferring said at least one surfaceor shape property on said display element.
 127. The multi-color displayof claim 126, wherein said carrier comprises a polymeric material. 128.The multi-color display of claim 126, wherein said carrier comprises asemiconductor material.
 129. The multi-color display of claim 126,wherein said light emitting element is formed integrally with saidcarrier.
 130. The multi-color display of claim 126, wherein said lightemitting element is formed separately from said carrier and subsequentlyintegrated into said carrier.
 131. The multi-color display of claim 130,wherein said carrier comprises a coating on said light emitting element.132. The multi-color display of claim 130, wherein said light emittingelement is disposed in a recess in said carrier.
 133. The multi-colordisplay of claim 130, wherein said light emitting element is attached tosaid carrier.